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3 years ago

Someone please help me

Mathematics

2 answers:

satela [25.4K]3 years ago

8 0

Answer:

$80 + $32x = y

Step-by-step explanation:

80 dollars is mandatory, and will always be charged no matter how many hours the electrician works. The $32 is charged based on how many hours the electrician worked. We don't know how many hours he worked, therefore we put an X next to $32 as a way to remind ourselves to multiply the amount of hours he worked times how much he charges per hour. Y would be the total fee.

Rudik [331]3 years ago

7 0

32x+80=y

The 80 is an added fee and is NOT constant while the hourly rate goes up by 32 every hour. to get the total you add the hourly rate with the added fee.

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6)a garden was square, but last year she made it makes or shortening one side 5 meters and the other 8 meters. If the area of th

Alekssandra [29.7K]

Answer:

let dimention of original garden be x

then (x-8)(x-5) = 180

x^2 -13x -140 = 0

(x-20)(x+7)=0

x= 20 or x = -7

x = 20

original area = (20)^2

= 400 m^2

5 0

3 years ago

if you horizontally strech the quadratic parent function, f(x)=x^2, by a factor of 4, what is the equation of the new function?

max2010maxim [7]

Answer:

g(x) = x^2/16

Step-by-step explanation:

To stretch a function horizontally by a factor of k, replace x with x/k.

You want a stretch factor of 4, so your function is ...

g(x) = f(x/4) = (x/4)^2

g(x) = x^2/16

The attached graph shows the horizontal stretch.

8 0

3 years ago

Complete the square than convert to vertex form. y=2x^2+8x-9

8_murik_8 [283]

$y=2x^2+8x-9\\D=b^2-4ac\\D=64-4(2)(-9)\\D=64+72 > 0$

There are 2 roots so the only way to complete the square is,

$y=2x^2+8x-9\\y=2[(x^2+4x)]-9\\y=2[(x^2+4x+4)-4]-9\\y=2[(x+2)^2-4]-9\\y=2(x+2)^2-8-9\\y=2(x+2)^2-17$

Just factor 2 out of 2x^2+8x (just ignore the -9) then find the number that will make the terms be able to complete the square.

then complete the square and multiply 2 inside the brackets.

subtraction as you already get the vertex form and know how to complete the square.

Vertex Form: $y=2(x+2)^2-17$

3 0

3 years ago

Htuhrjnkemldjrhftrfejdkws

kondaur [170]

Answer:

2z + 4 = 8

Z = 2

Step-by-step explanation:

2z + 4 = 8

-4. -4

2z = 8

—- —

2. 2

z. =. 4

Easy Peasy! Hope this helped :) have great day!!

3 0

2 years ago

The perimeter of a rectangle is 66 cm.if the width of the rectangle is three more than half the length,find the length of the re

hoa [83]

<span>Let us use the variable x for length. So width will be 1/2x + 3. Perimeter = x+x+ 1/2x + 3 +1/2x + 3 = 3x + 6 = 66 Therefore 3x = 66-6 = 60 So x = 60/3 = 20 The length is 20 cm. Therefore the width = 1/2 of 20 + 3 = 10 + 3 = 13 cm Check: 20+20+13+13 = 66</span>

6 0

3 years ago